Add unit test for contextual escape

tests/_data/template/v2contextual.html

@@ -0,0 +1,30 @@
+@version(2)
+
+<a href="javascript:alert('{{ $var }}')">
+	{{ $var }}
+</p>
+
+<p onclick="location.href = '{{ $var }}';">
+	<span style="font: {{ $var }}">
+		{{ $var }}
+	</span>
+</p>
+
+<script type="text/javascript">
+	function() {
+		const foo = '{{ $var }}';
+		const bar = '{{ $var|noescape }}';
+		const json = @json($var);
+	}
+</script>
+
+<style>
+	body {
+		background-image: url('{{ $var }}');
+	}
+</style>
+
+<ul class="test">
+	<li>{{ $var }}</li>
+	<li>{{ $var|noescape }}</li>
+</ul>